C# 检测闪光灯是否已打开
我有一个简单的切换开关，打开和关闭手电筒的应用程序，我需要的代码，我可以用来检查手电筒是否已经打开，然后使用它来改变开关的切换状态。。。 如果服务报告手电筒亮了，我会发送一个广播意图将其关闭，反之亦然。。。我的应用程序逻辑在这里C# 检测闪光灯是否已打开,c#,android,xamarin,flashlight,C#,Android,Xamarin,Flashlight,我有一个简单的切换开关，打开和关闭手电筒的应用程序，我需要的代码，我可以用来检查手电筒是否已经打开，然后使用它来改变开关的切换状态。。。 如果服务报告手电筒亮了，我会发送一个广播意图将其关闭，反之亦然。。。我的应用程序逻辑在这里 class SecondActivity : AppCompatActivity{ protected override void OnCreate(Bundle onSavedInstanceState){ //Switch definition
class SecondActivity : AppCompatActivity{
protected override void OnCreate(Bundle onSavedInstanceState){
//Switch definition
Switch switch1 = this.FindViewById<Switch>(Resource.Id.switch2);
//Setting the intial status of the switch to be unchecked by default
switch1.Checked=false;
//Adding delegate method to handle switch checked event
switch1.CheckedChange += delegate (object sender, CompoundButton.CheckedChangeEventArgs e)
{
if (e.IsChecked==true)
{
//Switch is on so turn on Flahlight
Flashlight.TurnOnAsync();
Toast.MakeText(Application.Context, "Switch is ON", ToastLength.Long).Show();
}
else
{
//Switch is unchecked so turn off flashlight
Flashlight.TurnOffAsync();
Toast.MakeText(Application.Context, "Switch is OFF", ToastLength.Long).Show();
}
};
//Code to check if flashlight was turned on by an extra app activity
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="Please see following switch"/>
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch1"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:text="start"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="Stop"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="123@456"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="Please see following switch"/>
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch1"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:text="start"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="Stop"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="123@456"/>
</LinearLayout>
手电筒似乎只支持TurnOnAsync和TurnOffAsync。因此，考虑到您只想使用此API，我会在一开始将灯光设置为定义的状态，例如，关闭灯光，而不管其当前状态如何。在我更新的答案中，这是否有效？好的，听起来是一个很酷的主意，对我来说太不幸了。如果我现在去playstore并安装蓝牙应用程序，不知何故，如果我从外部触发器启用蓝牙，这些应用程序将知道并对UI进行必要的更改。。蓝牙有那个服务来检查它的状态吗？@Fildor，好的，我需要弄清楚out@Fildor，感谢您下载的progressFlashlight似乎只支持TurnOnAsync和TurnOffAsync。因此，考虑到您只想使用此API，我会在一开始将灯光设置为定义的状态，例如，关闭灯光，而不管其当前状态如何。在我更新的答案中，这是否有效？好的，听起来是一个很酷的主意，对我来说太不幸了。如果我现在去playstore并安装蓝牙应用程序，不知何故，如果我从外部触发器启用蓝牙，这些应用程序将知道并对UI进行必要的更改。。蓝牙有那个服务来检查它的状态吗？@Fildor，好的，我需要弄清楚out@Fildor，感谢您在progressCode中的下载。代码很长，但我会尝试应用它并查看是否得到一些结果。代码很长，但我会尝试应用它并查看是否得到一些结果
using Android.Hardware.Camera2;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Essentials;
namespace ForegroundServiceDemo
{
[Service]
class MyForegroundService : Service
{
public const int SERVICE_RUNNING_NOTIFICATION_ID = 10000;
[return: GeneratedEnum]
public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
{
CreateNotificationChannel();
string messageBody = "service starting";
Clipboard.ClipboardContentChanged += Clipboard_ClipboardContentChanged;
// / Create an Intent for the activity you want to start
Intent resultIntent = new Intent(this,typeof(Activity1));
// Create the TaskStackBuilder and add the intent, which inflates the back stack
TaskStackBuilder stackBuilder = TaskStackBuilder.Create(this);
stackBuilder.AddNextIntentWithParentStack(resultIntent);
// Get the PendingIntent containing the entire back stack
PendingIntent resultPendingIntent = stackBuilder.GetPendingIntent(0, PendingIntentFlags.UpdateCurrent);
var notification = new Notification.Builder(this, "10111")
.SetContentIntent(resultPendingIntent)
.SetContentTitle("Foreground")
.SetContentText(messageBody)
.SetSmallIcon(Resource.Drawable.main)
.SetOngoing(true)
.Build();
StartForeground(SERVICE_RUNNING_NOTIFICATION_ID, notification);
MyReceiver receiver = new MyReceiver();
RegisterReceiver(receiver, new IntentFilter("com.Java_Tutorial.CUSTOM_INTENT"));
return StartCommandResult.Sticky;
}
private async void Clipboard_ClipboardContentChanged(object sender, EventArgs e)
{
//throw new NotImplementedException();
var text = await Clipboard.GetTextAsync();
Toast.MakeText(this, text, ToastLength.Long).Show();
if (text.Contains("@"))
{
await Clipboard.SetTextAsync(text.Replace("@", ""));
}
}
public override void OnDestroy()
{
base.OnDestroy();
Clipboard.ClipboardContentChanged -= Clipboard_ClipboardContentChanged;
StopForeground(true);
}
public override IBinder OnBind(Intent intent)
{
return null;
}
void CreateNotificationChannel()
{
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
return;
}
var channelName = Resources.GetString(Resource.String.channel_name);
var channelDescription = GetString(Resource.String.channel_description);
var channel = new NotificationChannel("10111", channelName, NotificationImportance.Default)
{
Description = channelDescription
};
var notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.CreateNotificationChannel(channel);
}
}
//do you work
[BroadcastReceiver(Enabled = true, Exported = true)]
public class MyReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
CameraManager cameraManager = (CameraManager)context.GetSystemService(Context.CameraService);
var flashAvailable = cameraManager.GetCameraCharacteristics("0").Get(CameraCharacteristics.FlashInfoAvailable);
cameraManager.RegisterTorchCallback(new MyTorchRegister(), null);
if (MyTorchRegister.isFlashlightOn) {
MainActivity.switch1.Checked = false;
// Toast.MakeText(context, "FlashLight is disabled", ToastLength.Long).Show();
}
else
{
MainActivity.switch1.Checked = true;
// Toast.MakeText(context, "FlashLight is Opened", ToastLength.Long).Show();
}
}
internal class MyTorchRegister : CameraManager.TorchCallback
{
public static bool isFlashlightOn = false;
public override void OnTorchModeChanged(string cameraId, bool enabled)
{
base.OnTorchModeChanged(cameraId, enabled);
isFlashlightOn = enabled;
}
}
}
}
Switch switch1 = this.FindViewById<Switch>(Resource.Id.switch1);
//Setting the intial status of the switch to be unchecked by default
switch1.Checked = false;
//Adding delegate method to handle switch checked event
switch1.CheckedChange += delegate (object sender, CompoundButton.CheckedChangeEventArgs e)
{
if (e.IsChecked == true)
{
//Switch is on so turn on Flahlight
Flashlight.TurnOnAsync();
Intent intent = new Intent();
intent.SetAction("com.Java_Tutorial.CUSTOM_INTENT");
SendBroadcast(intent);
Toast.MakeText(Application.Context, "Switch is ON", ToastLength.Long).Show();
}
else
{
//Switch is unchecked so turn off flashlight
Flashlight.TurnOffAsync();
Intent intent = new Intent();
intent.SetAction("com.Java_Tutorial.CUSTOM_INTENT");
SendBroadcast(intent);
Toast.MakeText(Application.Context, "Switch is OFF", ToastLength.Long).Show();
}
};